Caddis have three stages: larvae (free, case-building or net spinning), pupae, and adults.
During my years on the Little Lehigh I found them unimportant. The prevalent ones were Black Caddis. I never saw one in the water. I assume the crawled in and out of the water (rgr)
Hydropsyche alternant, Spotted Sedge or Tan Caddis
Emerges from late afternoon into early evening during the summer into early autumn. Sizes 14-22.
Rhycophila abosalis, Olive Sedge
Emerges in the morning, continuing into early evening during the summer into autumn. Sizes 14-22.
Dolophiloides nigrita? or Chimarra atterima, Black Caddis
Emerges in the late afternoon into early evening during the summer;